Officers from Plumstead CID are investigating but there have been no arrests so far over the most recent incident.

Detective Inspector Charmaine Laurencin said: "We are keen to hear from anyone who may have seen or heard anything on Sunday. In particular we are keen to speak to a third member of the public, a man, who assisted the victim but left before police arrived on the scene.

"We would like to reassure members of the public that we have a team of detectives working on this case and exploring all investigative leads."